Finishing apparatus in copying machine

ABSTRACT

A finishing apparatus in a copying machine is disclosed, which can finish large sized papers without enlarging the size of a tray base. The finishing apparatus includes a jogging assembly  170  aligning papers in left and right directions, a paper contact plate  166  provided with a stapler  196 , a paper roller  200  pushing the papers to a paper stacker  134 , ends of the papers being positioned in the stapler, a tray base  10  moving in a direction opposite to the paper roller to guide alignment of a set of the papers, and an angle adjusting unit guiding the papers by adjusting a tilt angle of the papers in accordance with the size of the papers.

TECHNICAL FIELD

The present invention relates to a copying machine or printer having afinishing apparatus provided with a paper stacker and a tray unit, andmore particularly to a tray unit that finishes papers printed by acopying machine and moves the finished papers to a paper stacker.

BACKGROUND ART

Papers finished by a copying machine or printer are temporarily stackedonto a tray unit for finishing processes such as stapling and bookletand then move to a paper stacker through a series of processes.

The papers stacked onto the paper stacker are aligned depending oncontact with papers moved from the tray unit or distance between thepaper stacker and the tray unit.

One example of a related art finishing apparatus in a copying machine isdisclosed in the Japanese Patent Publication No. 4-316894.

A structure of a copying machine having a related art finishingapparatus will be described with reference to FIGS. 1 to 3.

FIG. 1 is a sectional view illustrating an outlet of a copying machinehaving a related art finishing apparatus. FIGS. 2 a and 2 b aresectional views illustrating the operation of the related art tray unit.FIG. 3 is a plane view of the related art tray unit.

A housing 15 of a related art finishing apparatus 12 is detachablyprovided in a copying machine 11. That is, the housing 15 of thefinishing apparatus 12 can be detached from the copying machine 11 by afixed portion 16.

The finishing apparatus 12 may be provided in the copying machine 11 toform a single body without being detached from the main body of thecopying machine 11. The finishing apparatus 12 is connected with thecopying machine 11 through a path network 18.

The path network 18 includes paper paths 20 and 21 having a roller 22and a deflector 24.

The roller 22 and the deflector 24 are driven by a driving part 25. Anoutlet 28 is formed by the roller 22 and ejects papers through the paperpath 20 or 21.

The paper paths 20 and 21 move the papers to an upper paper stacker 32and a lower paper stacker, respectively.

At the outlet of the paper path 21, a rolling wheel 36 and a waveformroller 38 are provided along with the roller 22. The roller 22 has anarc shaped waveform to facilitate ejection of the papers at a properspeed. The rolling wheel 36 and the waveform roller 38 act to push thepapers from the outlet.

The upper paper stacker 32 is fixed to the housing 15 while the lowerpaper stacker 34 is supported by an elevator assembly 44 and is linkedto a side shift plate 45.

The paper stackers 32 and 34 are tilted to have a predetermined angleand allow a set of respective papers or stapled papers to be easilystacked thereon.

The elevator assembly 44 includes a truck 51, a cable 52 wound in a pairof pulleys 54, and an elevator support member 48.

The elevator support member 48 is slidably connected with the truck 51and moves up and down in response to movement of the cable 52.

The pulley 54 is driven by an elevator motor 56, and the elevator motor56 and the driving part 25 are programmably controlled by a controller58.

Meanwhile, a tray base 10 is slidably fixed to a pair of support rails62. The support rails 62 are fixed to both sides of the housing 15 butone support rail 62 is shown in a sectional structure of FIG. 1.

The tray base 10, as shown in FIG. 3, is formed of a rectangular shapedplate of metal or plastic, and a channel 69 is provided in a movementbase in parallel with a moving direction of the papers.

The tray base 10 includes one or more paper contact plates 66 providedto form a single body with the corner of the tray unit, and apositioning unit having a side plate 68.

The positioning unit is provided with a jogging assembly 70. A wheel 2connected with a shaft 73 is provided in the jogging assembly 70.

The wheel 72 is parallel with the surface of the tray base 10 and formsan acute angle with the plane of the side plate 68.

The shaft 73 is connected with a motor 74 which is connected with thecontroller, and the motor 74 drives the wheel 72.

Furthermore, when the stapled papers are input and output, a sensor 76is provided below the tray base 10 to sense the height of the lowerpaper stacker 34.

The sensor 76 includes a paper clamp unit 77 and a switch 78. The switch78 is connected with the controller 58.

The clamp unit 77 is bound into a predetermined arc and moves betweenthe first part triggering the position of an open switch and the secondpart triggering the position of a closed switch.

Meanwhile, as shown in FIG. 1, the tray base is provided in such amanner that a reciprocating mechanism 80 elastically supported by aspring is connected with the finishing apparatus 12.

The reciprocating mechanism 80 is provided with a rotatable cam follower82 which is connected to the rear of the tray base 10. The cam follower82 is elastically supported by a spring 88 and is driven by a cam 90.

The cam 90 is fixed to a shaft 92 which is controlled by a motor 94. Themotor 94 is connected with the controller 58.

The aforementioned reciprocating mechanism 80 can reciprocate the camfollower 82 and the tray base 10 when the cam 90 rotates along with theshaft 92 because the shaft 92 is eccentric with respect to thecircumference of the cam 90.

The structure of the related art finishing apparatus will be describedin more detail with reference to FIGS. 2 a and 2 b.

A general stapler that staples papers is denoted by a reference numeral96.

The stapler 96 is arranged to staple the corner of papers.

A base (anvil) having a sufficient area is provided so that a set ofpapers are not scattered during or before stapling operation when thepapers are set between a core of the stapler 96 and the tray base 10.

The stapler 96 is provided at the rear of the tray base 10 andreciprocates along with the tray base 10.

Since the paper contact plate 66 is matched with and fitted into achannel 69, the paper contact plate 66 freely moves in the channel 69when the tray base 10 is retracted.

The stapled papers can be extruded from the tray base 10 using a paperroller 100.

A driving gear 106 elastically supported by a spring is connected withthe rear of the paper roller 100. The driving gear 106 has a structuresimilar to that of the reciprocating mechanism 80.

The driving gear 106 is provided with a cam follower 110. The camfollower 110 is elastically supported by a spring 112.

A cam 114 is fixed to the shaft 92 and reciprocates the cam follower 110when the cam 90 reciprocates the cam follower 82.

The cams 90 and 114 are provided in such a manner that the front end ofthe tray base 10 is retracted to the front corner of the housing 15 orthe end of the paper roller 100 moves to the front corner of the housing15.

The operation of the aforementioned related art finishing apparatus willnow be described.

Copying papers are fed to the deflector 24 arranged at a branch of thepaper paths 20 and 21. If the papers are directly ejected withoutstapling operation, the deflector 24 conveys the papers to the uppermoving path 20 using the driving part 25 and the controller 58. If thefinishing process such as stapling is performed, the papers move to thelower moving path 21 using the driving part 25 and the controller 58.

If the printed papers are ejected from the end of the outlet of thelower paper path 21, the papers are arranged on both the lower paperstacker 34 and the tray base 10.

In other words, the first part of the papers is arranged on the lowerpaper stacker 34 while the second part is arranged on the tray base 10.

Since the paper stacker and the tray base are tilted at a predeterminedangle, the second part of the papers arranged on the tray base is slidtoward the rear of the tray base 10 by means of gravity and paperpositioning is made in a moving direction of the papers by means of thepaper contact plate 66.

At this time, the jogging wheel 72 rotates as the motor 74 is driven bya signal of the controller 58. The corners of the papers moved by thejogging operation of the wheel 72 are pushed to the corners defined bythe paper contact plate 66 and the side plate 68.

Therefore, positioning of the papers is made in such a manner that thecorners of the papers are perpendicular to the moving direction of thepapers.

The waveform roller 38 and the rolling wheel 36 serve to control thespeed of the papers when the papers are ejected from the paper path 21and align the papers so as to prevent the papers from being scattered.

The positioned papers are stapled by the stapler 96 arranged at thecorner.

Subsequently, the driving gear 106 operates as the motor 94 is driventhrough the controller, so that the paper roller 100 advances throughthe channel 69. The tray base 10 is retracted by the reciprocatingmechanism 80 so that the stapled papers are ejected to the paper stacker34.

If the paper roller 100 advances, the end of the paper roller 100 is incontact with the second part (lower part) of the stapled papers so as topush the contact part to the paper stacker 34 and at the same time movethe tray base 10 and the papers in an opposite direction. Also, sincethe sensor 76 is retracted along with the tray base 10, the clamp unit77 rotates from the first part to the second part, thereby moving theswitch 78 to the open position.

When the corner at the rear of the stapled papers reaches the corner atthe front of the housing 15, the papers are dropped onto the lower paperstacker 34.

Before the stapled papers are ejected from the tray base 10, thecontroller 58 transmits the signal received from the motor 94 to theelevator motor 56 and drops an elevator support member 48 by apredetermined distance.

The drop distance of the paper stacker is maintained within the rangethat the papers stacked onto the paper stacker 34 do not interfere dropof the next papers.

If the papers subjected to the finishing process such as stapling areejected onto the paper stacker, the tray base 10 returns to the originalposition of FIG. 2 a.

Once the tray base 10 returns to the original position, the paperstacker 34 connected with the elevator support member 48 starts toascend by means of action of the truck 51.

The paper stacker 34 is shifted to the side by action of the side shiftplate 45 before ascending operation. That is, the paper stacker 34 isdisposed in the side by the side shift plate so that the stapled papersare stacked onto the paper stacker in a zigzag pattern, therebyfacilitating distribution and disposal of the papers.

If the paper stacker 34 continues to ascend, the upper part of thepapers stacked onto the paper stacker 34 is in contact with the clampunit 77. The clamp unit 77 is pushed upwardly to turn off the switch 78.

Once the switch 78 is turned off, the signal is transmitted to thecontroller 58. The controller 58 transmits the signal to the elevatormotor 56 to stop movement of the elevator support member 48.

However, the aforementioned related art finishing apparatus has severalproblems.

The distance between the tray base 10 and the paper stacker 34 isuniformly maintained regardless of the movement of the tray base 10 tothe paper stacker 34, i.e., the front end of the housing 15 or the rearend of the housing 15. In this case, it is difficult to facilitate thefinishing process of large sized papers.

The problems of the related art finishing apparatus will be described inmore detail with reference to FIGS. 4 and 5.

If the papers are ejected through the paper path in a state where thetray base 10 of the tray unit is completely extended to the paperstacker 34, the tray base 10 guides the papers to the paper contactplate 66.

As shown in FIG. 4, if small sized papers 13 are provided, the papersare guided to the paper contact plate 66 in a state where the first andsecond part A and B of the papers are stably supported by the tray base10. However, if large sized papers 13 are provided as shown in FIG. 5,the first part A of the papers ejected through the paper path isarranged on the paper stacker 34 and the second part B of the papers isarranged on the tray base 10.

If the papers are arranged on the paper stacker and the tray base asshown in FIG. 5, in the structure of the related art tray unit, fold “C”of the papers occurs at the outer end of the tray base 10. Such foldprevents the papers from being smoothly slid to the paper contact plate66.

The large sized papers may be slid to the paper contact plate withoutfold by increasing the extension length of the tray base 10. However, inthis case, problems arise in that the volume of the apparatus increasesand reciprocating time of the tray base increases, thereby reducingefficiency of the apparatus.

In other words, the related art finishing apparatus has problems in thatthe finishing process of various sized papers, especially large sizedpapers cannot be performed with the small volume of the apparatus.

DISCLOSURE OF THE INVENTION

Accordingly, the present invention is directed to a finishing apparatusin a copying machine that substantially obviate one or more of theproblems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a finishing apparatusin a copying machine that smoothly guides large sized papers to a papercontact plate and improves the state of papers to be stacked onto apaper stacker.

Another object of the present invention is to provide a finishingapparatus in a copying machine that can finish large sized paperswithout enlarging the size of a tray base.

Other object of the present invention is to provide a finishingapparatus in a copying machine that can improve finishing efficiency ofpapers by reducing the size of a tray base.

Additional features and advantages of the invention will be set forth inthe description which follows, and in part will be apparent from thedescription, or may be learned by practice of the invention. Theobjectives and other advantages of the invention will be realized andattained by the structure particularly pointed out in the writtendescription and claims thereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purposeof the present invention, as embodied and broadly described, a finishingapparatus in a copying machine according to the present invention ischaracterized in that small sized papers are smoothly guided to acontact plate by tilting a tray base while large sized papers are guidedto the contact plate by reducing an angle of the tray base to make thedistance between a paper stacker and the tray base narrow and not toallow the papers arranged in the paper stacker and the tray unit to befolded.

To further achieve these and other advantages and in accordance with thepurpose of the present invention, a finishing apparatus in a copyingmachine according to the present invention includes a jogging assembly170 aligning papers in left and right directions, at least one stapler196 and a paper contact plate 166, a paper roller 200 pushing the papersto a paper stacker 134, ends of the papers being positioned in thestapler, a tray base 10 moving in a direction opposite to the paperroller to guide alignment of a set of the papers, and an angle adjustingunit guiding the papers by adjusting the angle of the tray base inaccordance with the size of the papers.

The angle adjustment of the tray base is made by a recess groove 131formed at a predetermined position (a rotary shaft supporting the traybase) on the tray base moving along a support roller 130 to recess thesupport roller.

In other words, if the tray base movably supported on the support rollermoves to the paper stacker 134 and is recessed in the recess groove 131formed in the tray base, the outer end at the front of the tray base isdropped by a predetermined distance.

As described above, since the angle adjustment of the tray base guidingalignment of a set of the papers is made while moving in a directionopposite to the paper roller, when the large sized papers are guided tothe contact plate, the papers are slid to the contact plate by reducingthe angle of the tray base to allow the surfaces of the papers arrangedin the paper stacker 134 and the tray unit 160 not to be folded. Whenthe small sized papers are guided to the contact plate, the papers areslid to the contact plate by tilting the tray base.

The tray base 10 has one end connected with one end of a rotational link210 and the other end of the rotational link is fixed to a fixed shaft150 to reciprocate the rotational link along the contact plate 166. Theother end of the rotational link is provided with a gear 125 to form asingle body with the rotational link, and the gear 125 is engaged with adriving motor gear 110 to rotate the rotational link.

Meanwhile, when the papers are guided to the paper contact plate or thefinished papers are stacked onto the paper stacker 134 by pushing themfrom the paper contact plate 166, the clamp unit 177 is linked to therotational link 210 so as to prevent the papers from being scattered.

The clamp unit 177 pushes the papers stacked onto the paper stacker andis detached from the end of the papers to the paper contact plate whenthe finished papers are dropped onto the paper stacker 134, i.e., at aposition where the tray base 10 is completely retracted.

If the tray base moves outwardly to guide the papers moving for thefinishing process through a paper path network, the clamp unit 177 movestogether to push the end of the papers stacked onto the paper stacker.

The paper path network is provided with a rolling wheel 136 to align thepapers.

The finishing apparatus in a copying machine according to the presentinvention is provided with the related art elements such as an elevatorassembly and a shaft shift plate to move up and down and enableeccentric movement of the paper stacker.

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention andtogether with the description serve to explain the principles of theinvention.

In the drawings:

FIG. 1 is a sectional view illustrating a copying machine having arelated art finishing apparatus;

FIGS. 2 a and 2 b are partial sectional views illustrating the operationof the related art finishing apparatus;

FIG. 3 is a plane view of the related art finishing apparatus;

FIGS. 4 and 5 are sectional views illustrating problems of the relatedart finishing apparatus;

FIG. 6 is a sectional view illustrating a structure of a finishingapparatus according to the present invention;

FIGS. 7 a to 7 c are sectional views illustrating the operation of thefinishing apparatus according to the present invention;

FIG. 8 is a plane view illustrating a main part of the finishingapparatus according to the present invention;

FIG. 9 is an exploded perspective view illustrating the main part of thefinishing apparatus according to the present invention; and

FIG. 10 is a perspective view illustrating the main part of thefinishing apparatus according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings.

A finishing apparatus in a copying machine according to the presentinvention includes a jogging assembly 170 aligning papers in left andright directions, a paper contact plate 166, a paper roller 200 pushingthe papers set in the paper contact plate 166 to a paper stacker 134, atray base 10 moving in a direction opposite to the paper roller to guidealignment of a set of the papers, and an angle adjusting unit providedin the tray base.

The angle adjusting unit includes a support roller 130 supporting thetray base to move the tray base and a recess groove 131 formed at apredetermined position on the tray base to recess the support roller.

The tray base 10 is connected with one end of a rotational link 210 toreciprocate along the contact plate 166, and the other end of therotational link is fixed to a fixed shaft 150 so that a gear 125provided to form a single body with the rotational link is engaged witha driving motor gear 110.

The rotational link 210 is linked to a paper clamp unit 177 that pushesthe papers stacked onto the paper stacker at a position where the traybase 10 moves to the paper stacker 134 while is detached from the paperstacker to be retracted to the paper contact plate at a position wherethe tray base 10 is retracted to the paper contact plate 166.

A rolling wheel 136 that guides the papers to the paper contact plate166 is provided on the jogging assembly 170.

The paper stacker 134 is provided to move up and down.

The finishing apparatus in a copying machine according to the presentinvention will be described in more detail with reference to FIGS. 6 to10.

The related art structure can be applied to the finishing apparatus in acopying machine according to the present invention within the range thatit does not depart from an object of the present invention.

The description of the same technical structure as that of the relatedart finishing apparatus will be omitted and a tray unit which is a mainfeature of the present invention will be described in detail.

As shown in FIG. 7 a, a tray unit 160 of the present invention isprovided in such a manner that papers 13 are fed from the copyingmachine to the tray unit 160 through a paper path network 180, aresubject to the finishing process such as stapling, and are stacked ontoa paper stacker 134. The paper stacker 134 can be provided by therelated art, which moves up and down with respect to the tray unit 160and is shifted to a side to enable reciprocation.

The tray unit 160 is provided with a pair of paper conveying rollers122. The papers 13 are fed through an outlet formed by the paperconveying rollers 122 and then move to a tray base 10 through a rollingwheel 136 provided on the paper stacker. The tray base 10 guides thepapers 13 to the paper contact plate 166.

Since the tray base 10 is tilted at a predetermined angle, the papers 13moved from the first part “A” are slid along the surface of the traybase so that the second part “B” moves to the paper contact plate 166.

The width of the papers 13 aligned on the paper contact plate, as shownin FIGS. 6 and 10, is defined by driving a jogging assembly 170. Thejogging assembly 170 is driven by a motor (not shown).

As shown in FIG. 7 a, if a predetermined number of papers 13 are alignedon the paper contact plate 166, a stapler 196 provided at the rear endof the paper contact plate 166 staples the corners of the papers. Aplurality of staplers may be provided.

The papers stapled by the stapler, as shown in FIG. 7 b, move to theouter end of the tray base 10 by allowing a paper roller 200 to push thesecond part “B” of the papers. At the same time, the tray base 10 isretracted to the paper contact plate so as not to prevent the papersfrom being stacked onto the paper stacker 134.

Meanwhile, a clamp unit 177 is provided to prevent the papers stackedonto the paper stacker from being misaligned by being in contact withpapers moving for the finishing process. The clamp unit 177 is driven ina state where it is linked to the tray base 10.

As shown in FIG. 7 a, in a state where the tray base 10 is outwardlyextended to guide the papers fed from the paper conveying rollers 122 tothe paper contact plate 166 to perform the finishing process, the clampunit 177 pushes the papers stacked onto the paper stacker 134. As shownin FIG. 7 c, when the finished papers (stapled papers) are stacked ontothe paper stacker 134 by pushing them from the paper contact plate 166,i.e., when the tray base 10 is retracted, the clamp unit 177 isretracted together so as not to prevent the papers from being stackedonto the paper stacker 134.

Preferably, the clamp unit 177 is temporarily retracted before thepapers are dropped onto the paper stacker 134 so that it pushes thepapers stacked onto the paper stacker 134 for a long time if possible.

In other words, as shown in FIG. 7 b, even if the tray base 10 isretracted, the clamp unit pushes the papers until the papers are droppedonto the paper stacker and moves at the time when the papers are droppedonto the paper stacker so as not to prevent the papers from beingstacked onto the paper stacker.

Particularly, the tray base 10 includes an angle adjusting unit that canadjust an angle depending on the size of the papers.

The angle adjusting unit of the tray base will be described in moredetail with reference to FIGS. 6, 8, 9, and 10.

The angle adjusting unit of the tray base is provided in such a mannerthat the tray base 10 moves along a support roller 130. The angleadjusting unit includes a recess groove 131 recessed with apredetermined depth at a predetermined position of the tray base whichis in contact with the support roller 130.

The tray base provided with the recess groove 131 reciprocates along thepaper contact plate 166 by means of a rotational link 210. Therotational link 210 rotates clockwise or counterclockwise around a fixedshaft 150. A gear 125 is provided in the rotational link 210 to form asingle body with the rotational link 210. The gear 125 is engaged with adriving motor gear 110 of a driving motor (not shown) to reciprocate therotational link 210 at a predetermined angle.

Meanwhile, the clamp unit 177 is fixed to a clamp unit support 19provided in the tray unit. The clamp unit support 19 is fitted into asupport shaft 16 in a state where the end of the clamp unit 177 iselastically supported toward the paper stacker 134 by a spring 79.

The support shaft 16 is interposed between a clamp unit driving ring 40and the clamp unit 177 and movably supports the clamp unit 177 and theclamp unit driving ring 40. The clamp unit driving ring 40 has a lineartype ring shape and is fitted into an extension 41 formed at a middlepart of the rotational link 210.

In a state where the rotational link 210 rotates clockwise so as not tocompletely retract the tray base 10, the extension 41 freely movesaround a slit groove 81 in the driving ring 40 so as not to retract theclamp unit 177. However, in a state where the rotational link 210 isretracted, the end of the driving ring 40 is caught in the extension 41.For this reason, the driving ring 40 moves downwardly so that the clampunit 177 fixed to the support shaft 16 is retracted downwardly.

If the rotational link 210 rotates counterclockwise to guide the papersmoving through the paper conveying rollers to the paper contact plate166, the tray base 10 moves upwardly (toward the paper stacker). Theclamp unit 177 returns to the original position by means of action ofthe spring 79 provided in the clamp unit support.

The clamp unit returned to the original position pushes again the papersstacked onto the paper stacker 134.

In the present invention, when the rotational link rotatescounterclockwise to extend the tray base 10 to the paper stacker, thesupport roller 130 is recessed in the recess groove 131 formed below thetray base so that the tray base is dropped by a predetermined distance.Thus, the distance between the outer end of the tray base 10 and thesurface of the paper stacker 134 is reduced.

The angle adjusting unit of the tray base 10 according to the presentinvention is driven so as not to change the angle of the tray base byallowing the recess groove 131 not to be positioned in the supportroller 130 if small sized papers moves to the tray base through thepaper conveying roller.

Meanwhile, if large sized papers move to the tray base through the paperconveying roller, the angle adjusting unit is driven to position therecess groove 131 in the support roller 130, thereby dropping the end ofthe tray base by a predetermined distance.

As described above, the angle adjustment of the tray base is madedepending on the size of the papers. Therefore, when the large sizedpapers are guided to the contact plate, the papers are smoothly slid tothe contact plate by allowing the surfaces of the papers arranged in thepaper stacker 134 and the tray unit 160 not to be folded. When the smallsized papers are guided to the contact plate, the papers are smoothlyslid to the contact plate by tilting the tray base.

At the position of the rotational link 210 and the tray base 10 markedby a dotted line of FIG. 6, the small sized papers are guided. At theposition of the rotational link 210 and the tray base 10 marked by asolid line of FIG. 6, the large sized papers are guided.

It is apparent that the angle adjusting unit of the tray base accordingto the present invention can be driven by the controller, the drivinggear, and the sensor described in the related art in combination.Moreover, any modification may be made to the structure of the angleadjusting unit of the tray base according to the present invention foruse in various printing apparatuses such as a digital printer inaddition to the copying machine.

Furthermore, while the two-stage angle of the tray base has beendescribed in the present invention, its three-stage or four-stage anglecan be made to the tray base by additionally providing the tray basewith a separate extension which is in contact with the support roller.

INDUSTRIAL APPLICABILITY

As aforementioned, the finishing apparatus according to the presentinvention has the following advantages.

The finishing apparatus, as shown in FIG. 6, includes a jogging assembly170 aligning papers in left and right directions, a stapler 196, a papercontact plate 166, a paper roller 200 pushing the papers to a paperstacker 134, ends of the papers being positioned in the stapler, and atray base 10 moving in a direction opposite to the paper roller to guidealignment of a set of the papers. Particularly, since the tray base isprovided with the angle adjusting unit that guides the papers by varyingthe angle of the tray base depending on the size of the papers, thelarge sized papers can be finished without enlarging the size of thetray base. In addition, since the size of the tray base is not enlarged,the reciprocating time of the tray base can be reduced, therebyimproving finishing efficiency of the papers.

While the present invention has been described and illustrated hereinwith reference to the preferred embodiments thereof, it will be apparentto those skilled in the art that various modifications and variationscan be made therein without departing from the spirit and scope of theinvention. Thus, it is intended that the present invention covers themodifications and variations of this invention that come within thescope of the appended claims and their equivalents.

1. A finishing apparatus in a copying machine comprising: a joggingassembly aligning papers in left and right directions; a paper contactplate; a paper roller pushing the papers set in the paper contact plateto a paper stacker; a tray base moving in a direction opposite to thepaper roller to guide alignment of a set of the papers; and an angleadjusting unit provided in the tray base.
 2. The finishing apparatus ina copying machine according to claim 1, wherein the angle adjusting unitincludes a support roller supporting the tray base and a recess grooveformed at a predetermined position on the tray base to recess thesupport roller.
 3. The finishing apparatus in a copying machineaccording to claim 1, wherein the tray base has one end connected withone end of a rotational link to reciprocate along the contact plate, andthe other end of the rotational link is fixed to a fixed shaft androtates at a predetermined angle around the fixed shaft.
 4. Thefinishing apparatus in a copying machine according to claim 3, whereinthe rotational link is linked to a paper clamp unit that pushes thepapers stacked onto the paper stacker at a position where the tray basemoves to the paper stacker while is detached from the paper stacker tothe paper contact plate at a position where the tray base is retractedto the paper contact plate.
 5. The finishing apparatus in a copyingmachine according to claim 1, further comprising a rolling wheel thatguides the papers to the paper contact plate.
 6. The finishing apparatusin a copying machine according to claim 1, wherein the paper stacker isprovided to move up and down.
 7. The finishing apparatus in a copyingmachine according to claim 1, further comprising at least one staplerthat staples the papers set in the paper contact plate before pushingthem to the paper stacker.